C#递归方法实现无限级分类显示效果实例

2020-01-24 01:07:27

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本文实例讲述了C#递归方法实现无限级分类显示效果。分享给大家供大家参考，具体如下：

运行效果如下图所示：

具体代码如下：

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="RoleDemo20150305.aspx.cs" Inherits="RoleDemo20150305" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head runat="server">  <title>C#无限级分类递归显示示例</title>  <style type="text/css">  span { float:left; clear:both;}  </style>  <script src="JS/jquery-1.9.1.js" type="text/javascript"></script>  <script type="text/javascript">    $(function () {      $("span").eq(0).show();      $("span").each(function (i) {        var curr = $(this).attr("data-id");        $(this).click(function () {          $("span").each(function (i) {            var father = $(this).attr("data-father");            if (father == curr) {              $(this).show();            }          });        });      });    });  </script></head><body>  <form id="form1" runat="server">  <div>    <asp:GridView ID="GridView1" runat="server">    </asp:GridView>    <br/><br/><br/><br/>    <asp:Literal ID="lt1" runat="server"></asp:Literal>  </div>  </form></body></html>

using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Text;using System.Data;using System.Web.UI;using System.Web.UI.WebControls;public partial class RoleDemo20150305 : System.Web.UI.Page{  protected void Page_Load(object sender, EventArgs e)  {    DataTable dt = createDT();    DataTable dtFinal = dt.Clone();    List<string> list = new List<string>();    string userStr = GetUserData();    if (userStr.Contains(","))    {      string[] strs = userStr.Split(',');      for (int i = 0; i < strs.Length; i++)      {        list.Add(strs[i]);      }    }    else    {      list.Add(userStr);    }    for (int i = 0; i < list.Count; i++)    {      string module_id = list[i];      DataRow[] drSource = dt.Select(" module_id = '" + module_id + "'"); //最终DT是否存在该数据      DataRow[] drExist = dtFinal.Select(" module_id = '" + module_id + "'"); //最终DT是否存在该数据      if (drExist.Length == 0)      {        dtFinal.Rows.Add(drSource[0]["module_id"], GetPreTag(drSource[0]["module_level"]) + drSource[0]["module_name"], drSource[0]["module_fatherid"],          drSource[0]["module_url"], drSource[0]["module_order"], drSource[0]["module_level"]); //添加记录      }      FindFatherFromDT(dt, drSource, dtFinal);    }    //显示方式一    DataView dv = dtFinal.DefaultView;    dv.Sort = "module_id asc";    DataTable dtNeed = dv.ToTable();    GridView1.DataSource = dtNeed;    GridView1.DataBind();    //显示方式二    StringBuilder builder = new StringBuilder();    for (int i = 0; i < dtNeed.Rows.Count; i++)    {      DataRow dr = dtNeed.Rows[i];      builder.AppendLine("<span data-id='" + dr["module_id"] + "' data-father='" + dr["module_fatherid"] + "' style='display:none'>"       + dr["module_name"] + "</span>");    }    lt1.Text = builder.ToString();  }  /// <summary>  /// 继续追溯添加父类记录  /// </summary>  /// <param name="dt"></param>  /// <param name="dtFinal"></param>  protected void FindFatherFromDT(DataTable dt, DataRow[] drFather, DataTable dtFinal)  {    DataRow[] drFatherUp = dt.Select(" module_id = '" + drFather[0]["module_fatherid"] + "'");    DataRow[] drFatherUpExist = dtFinal.Select(" module_id = '" + drFather[0]["module_fatherid"] + "'");    if (drFatherUp.Length > 0 && drFatherUpExist.Length == 0) //该记录存在父类且父类未添加到最终DT    {      dtFinal.Rows.Add(drFatherUp[0]["module_id"], GetPreTag(drFatherUp[0]["module_level"]) + drFatherUp[0]["module_name"], drFatherUp[0]["module_fatherid"],          drFatherUp[0]["module_url"], drFatherUp[0]["module_order"], drFatherUp[0]["module_level"]); //继续追溯添加父类记录      FindFatherFromDT(dt, drFatherUp, dtFinal);    }  }  #region 添加前缀  protected string GetPreTag(object num)  {    string pre = string.Empty;    int i = Convert.ToInt32(num);    if (i < 2)    {    }    else if (i == 2)    {      pre += "└";    }    else    {      pre += "└";      for (int j = 0; j < i - 2; j++)      {        pre += "─";      }    }    return pre;  }  #endregion  #region 用户测试数据  protected static string GetUserData()  {    DataTable dt = new DataTable();    dt.Columns.Add("userId");    dt.Columns.Add("userModuleOption");    dt.Rows.Add("张三", "M01010305,M010205,M0101030301");    return dt.Rows[0]["userModuleOption"].ToString();  }  #endregion  #region 创建数据  protected static DataTable createDT()  {    DataTable dt = new DataTable();    dt.Columns.Add("module_id");    dt.Columns.Add("module_name");    dt.Columns.Add("module_fatherid");    dt.Columns.Add("module_url");    dt.Columns.Add("module_order");    dt.Columns.Add("module_level");    dt.Rows.Add("C1", "全国", "0", "", "1", "1");    dt.Rows.Add("M01", "广东", "C1", "", "1", "2");    //深圳    dt.Rows.Add("M0101", "深圳", "M01", "3.aspx", "100", "3");    dt.Rows.Add("M010101", "南山区", "M0101", "4.aspx", "1000", "4");    dt.Rows.Add("M010102", "罗湖区", "M0101", "", "1001", "4");    dt.Rows.Add("M010103", "福田区", "M0101", "", "1002", "4");    dt.Rows.Add("M010104", "宝安区", "M0101", "", "1003", "4");    dt.Rows.Add("M010105", "龙岗区", "M0101", "", "1004", "4");    //深圳 - 福田区    dt.Rows.Add("M01010301", "上梅林", "M010103", "", "1002001", "5");    dt.Rows.Add("M01010302", "下梅林", "M010103", "", "1002002", "5");    dt.Rows.Add("M01010303", "车公庙", "M010103", "", "1002003", "5");    dt.Rows.Add("M01010304", "竹子林", "M010103", "", "1002004", "5");    dt.Rows.Add("M01010305", "八卦岭", "M010103", "", "1002005", "5");    dt.Rows.Add("M01010306", "华强北", "M010103", "", "1002006", "5");    //深圳 - 福田区 - 车公庙    dt.Rows.Add("M0101030301", "天安数码城", "M01010303", "", "100200301", "6");    //广州    dt.Rows.Add("M0102", "广州", "M01", "", "101", "3");    dt.Rows.Add("M010201", "越秀区", "M0102", "", "1105", "4");    dt.Rows.Add("M010202", "海珠区", "M0102", "", "1106", "4");    dt.Rows.Add("M010203", "天河区", "M0102", "", "1107", "4");    dt.Rows.Add("M010204", "白云区", "M0102", "", "1108", "4");    dt.Rows.Add("M010205", "黄埔区", "M0102", "", "1109", "4");    dt.Rows.Add("M010206", "荔湾区", "M0102", "", "1110", "4");    dt.Rows.Add("M010207", "罗岗区", "M0102", "", "1111", "4");    dt.Rows.Add("M010208", "南沙区", "M0102", "", "1112", "4");    return dt;  }  #endregion}

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